UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36

Steps to reproduce the problem:
Just visit jsPerf test

or run this code:

array = [];
for (i = 0; i < 999; i++) array.push(i);
times = [];
time = performance.now();
for (i = 0; i < 9999; i++) array.slice();
times.push(performance.now() - time);
time = performance.now();
for (i = 0; i < 9999; i++) array.slice(0);
times.push(performance.now() - time);
console.log('slice( ): %d\nslice(0): %d', times[0], times[1]);

What is the expected behavior?
The execution time of slice() and slice(0) should be similar

What went wrong?
slice() is around 40% slower than slice(0)

Did this work before? N/A 

Chrome version: 69.0.3497.81  Channel: stable
OS Version: OS X 10.13.6
Flash Version: